MIKROE-2735

      PAC1934 click PID: MIKROE-2735     PAC1934 click carries the PAC1934 four channel DC power/energy monitor from Microchip. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over an I2C interface. How the click works There are four 4-Terminal current sense shunt resistors connected to the current sense amplifier (in the chip). Electricity is brought to shunts via screw terminals. Middle screw connector is GND which can be used for bus voltage monitoring. This click enables energy monitoring with integration periods from 1 mS up to 36 hours or longer. Bus voltage, sense resistor voltage, and accumulated proportional power are stored in registers for retrieval by the system master or Embedded Controller. PAC1934 energy monitor features The PAC1934 is a four channel bi-directional high-side current-sensing device with precision voltage measurement capabilities, DSP for power calculation, and a power accumulator. It measures the voltage developed across an external sense resistor (VSENSE) to represent the high-side current of a battery or voltage regulator. The PAC1932/3/4 also measures the SENSE1+ pin voltages (VBUS). Specifications Type  Measurements  Applications  Power management systems, embedded applications, servers, personal computers, etc. On‐board  modules  PAC1934 four channel energy monitor from Microchip  Key Features  1% power measurement accuracy over a wide dynamic range, alert feature on  accumulator overflow and conversion complete, that could be enabled  Interface  I2C  Input Voltage  3.3V or 5V  Click board size  M (42.9 x 25.4 mm)  Pinout diagram This table shows how the pinout on PAC1934 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes  Pin  Pin  Notes    NC  1  AN  PWM  16  NC  RST  2  RST  INT  15  ALE  NC  3  CS  TX  14  NC  NC  4  SCK  RX  13  NC  NC  5  MISO  SCL  12  SCL  I2C clock  NC  6  MOSI  SDA  11  SDA  I2C data  Power supply  +3.3V  7  3.3V  5V  10  +5V  Power supply  Ground  GND  GND  9  GND  Ground    Reset  Alert pin          GND  8  Jumpers and settings Designator  Name  Default  Position  Default  Option  Description  JP1  PWR.SEL.  Left  3V3  Power Supply Voltage Selection 3V3/5V, left position  3V3, right position 5V  JP2  ADDR.SEL.  Left  20h  I2C Address select ‐ Left position 20h, Right position  3Eh  LEDs, Buttons, Switches, Connectors, etc. Designator  Name  Type (LED, BUTTON...)  LD1  PWR  LED   Description  Power indication LED Programming Code examples for PAC1934 click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet The following code snippet shows how to measure Current, Voltage, Power and Energy using the PAC1934 library. 01 char txt [30]; 02 float readValue; 03 PAC1934_sendCommand (_PAC1934_REFRESH_CMD); 04 delay_ms (200); 05 06 readValue = PAC1934_measureVoltage(4); 07 FloatToStr(readValue, txt); 08 LOG ("VBUS 4: "); 09 LOG (txt); 10 LOG (" Vrn"); 11 12 readValue = PAC1934_measureCurrent(4); 13 FloatToStr(readValue, txt); 14 LOG ("Current 4: "); 15 LOG (txt); 16 LOG (" mArn"); 17 18 readValue = PAC1934_measurePower(4); 19 FloatToStr(readValue, txt); 20 LOG ("Power 4: "); 21 LOG (txt); 22 LOG (" Wrn"); 23 24 readValue = PAC1934_measureEnergy(4, 8); 25 FloatToStr(readValue, txt); 26 LOG ("Energy 4: "); 27 LOG (txt); 28 LOG (" Jrn"); 29 30 LOG ("____________________rn"); 31 delay_ms (10000);                                                      https://shop.mikroe.com/pac1934‐click 9‐29‐17